Spatter resistance

The characteristics of interior paints that require testing and analysis include hiding and appearance, package stabiHty, adhesion, spatter resistance, flow and leveling, color and sheen uniformity, touch-up, stain removal, burnish resistance, and block and print resistance. A popular test that assesses the wet abrasion resistance of an interior paint is to measure its scmb resistance. A mechanical device is used to scmb a paint film of a specified thickness with a standard bmsh and abrasive cleanser suspension. The number of scmb cycles (back and forth movements of the weighted bmsh) at various end points (first cut through, or 50% removal of the film) is then recorded. Scmb resistance usually holds steady or decreases slightly as PVC is increased, but drops quickly once the CPVC is exceeded in a paint formulation. 

Greater film build promotes better hiding. Spatter resistance, also a high-shear application property, does not depend on thickener viscosity but does depend on the elasticity of the aqueous phase. Higher molecular weight thickeners are more elastic therefore, lower molecular weights are more resistant to spatter during roll application. 

The introduction of these new rheology modifiers provides paints manufacturers with a very attractive alternative to cellulosic thickeners. These rheology modifiers are the first acrylic associative thickeners that offer a similar rheology, in-can feeling, appearance, and application properties as cellulosic thickeners. They also show some key advantages compared to cellulosic thickeners. Supplied as liquids, they are easier to handle and because of their polymeric chemistry, they are less sensitive to microbial attack In application trials, professional painters found that new rheology modifier based paint performs similarly to cellulose thickened paint but with a better spattering resistance. 

Chem. Descrip. Polyether solution in water/butyidiglycol Uses Rheology control agent, associative thickener for aq. coatings Features Exc. applic. hiding, flow and leveling props., resist, props., roller appiic., spatter resist. 

Features For mid to high shear rheology exc. clarity, color acceptance, spatter resist. 

Features For strong low to mid shear rheology exc. spatter resist. 

Features Alkali-swellable provides roller spatter resist. 

Uses Rheology control agent, associative thickener, leveling agent for acrylic and vinyl acrylic latex paints, flat/matte and semigloss paints, gloss enamels, interior architectural topcoats, adhesives, cementitious prods., inks, mastics, slurries Features Good roller spatter resist. 

In paints using conventional polymeric thickeners, a balance among viscosity, wet film build and spatter resistance is often achieved with intermediate viscosity polymers together with mineral thixotropes. An alternative whieh has gained increasing acceptance over the past two decades is the use of associative thickeners, as will be discussed. 

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